Normally, old cells die, and new ones take their place.

New cells are made when they're not needed, and old cells don't die.

Somehow, aging is reversed, and old cells become young again.

I was dragged to my feet and taken back to my old cell.

This means a high population of old cells are not being replaced.

The old cell's life span took on that of a young cell.

Most are also compatible with the iPod touch, as well, if you're not quite ready to give up your old cell.

What you have just seen are cells at least six hundred years old with absolutely no sign of degeneration.

To the eye there was only one slight difference between the old cells and the new ones.

A human could be reanimated from 5000 year old cells.